Exhaust Heating Control Unit - Ford TRADER Workshop Manual

F2
EXHAUST CONTROLLED HEATING SYSTEM
~erminal
Colour of
Connected to
wire
A BR Exhaust heating
switch
B
RIL Clutch switch
C
-
-
0 UY
Neutral switch
E
0
Exhaust brake
switch
F
BIY.LIWw
Exhaust brake
switch
Exhaust heating
switch
H B
Ground·
I GIY Magnetic valve
(for exhaust
shutter valve)
J
-
-
K
R/BR Solenoid valve
(Intake shutter
valve)
Connector
•.... Pay load above 3.5t only
F2-48
EXHAUST HEATING CONTROL UNIT
Inspection
1. Measure the terminal voltage of the exhaust heating con-
trol unit when the vacuum switch connector disconnected.
2. If not as specified repair the wire harness or replace the con-
trol unit.
9TGOF2·123
Conditions of measuring
Voltage Possible· cause
(engine switch ON)
Exhaust heating switch OFF
Approx.12V Exhaust heating switch
Exhaust heating switch ON Approx.OV
(Refer to page F2-53)
Wire harness
Accelerator and clutch pedal Approx.OV Clutch switch
released (Refer to page F2-54)
Accelerator or clutch pedal
Approx.OV
Accelerator switch
depressed
(Refer to page F2-53)
Wire harness
-
- -
Neutral Approx.12V Neutral switch
In gear Approx.OV
(Refer to page F2-54)
Wire harness
Exhaust brake switch OFF Approx. 12V Exhaust brake switch
Exhaust brake switch ON Approx.OV
(Refer to page F2-55)
Wire harness
Constant Approx. 12V Exhaust brake switch
(Refer to page F2-55)
Exhaust heating switch
(Refer to page F2-53)
Wire harness
Constant
Approx.OV Wire harness
- Accelerator and clutch pedal Less than Magnetic valve
released
approx. 1V (Refer to page F2-50)
- Exhaust heating switch ON
Wire harness
- Accelerator and clutch pedal
Less than
released approx. 1V
-Neutral
• Exhaust brake switch ON
Except above conditions
:
Approx.12V
- - -
- Accelerator pedal depressed Less than Solenoid valve
less than half or clutch pedal approx. 1V (Refer to page F2-52)
depressed or both depressed Wire harness
- Exhaust heating switch ON
Except above conditions Approx.12V
K
I E C A
I~
~~~ ~ ~I
L
J .
H F 0
B
9TGOF2·124